Tenochtitlan

According to legend, Tenochtitlan was founded when an Aztec tribe saw the prophetic image of an eagle perched on a nopal cactus eating a snake. 

Located on an island in Lake Texcoco, Tenochtitlan became the capital of the Aztec empire. In the mid-1500s, Tenochtitlan was destroyed and leveled by Spanish conquestadors. 

Lake Texcoco was eventually filled. The Aztec temple dedicated to the principal deity Huitzilopochtli was destroyed. The stones were then used to build the Cathedral of the Assumption of Mary. 

Because of its massive size and due to the clay foundation and water table below, the cathedral is slowly sinking. Recently, while constructing an underground subway, city workers came across remains of Tenochtitlan. You can read another Aztec legend HERE.

Source: 

http://en.wikipedia.org/wiki/Tenochtitlan